GP Flashcards
(184 cards)
What are the two main categories of pruritus (itch)?
Dermatological and systemic causes.
What are common dermatological causes of itch?
Eczema, psoriasis, urticaria, scabies, contact dermatitis, lichen planus.
Fungal stuff
asteatotic eczema in older people, due to moisture loss of the skin
What are common systemic causes of itch?
Liver disease (cholestasis), renal disease, haematological disorders, endocrine disorders, neuropathic causes, psychogenic causes.
Which systemic conditions can cause generalised itch?
Liver disease, chronic kidney disease, lymphoma, iron deficiency, thyroid dysfunction, diabetes, neurological disorders.
Which haematological conditions can cause pruritus?
Polycythaemia vera, Hodgkin’s lymphoma, iron deficiency anaemia.
Low iron levels can lead to dry skin and increased sensitivity of nerve endings, resulting in generalized itching.
Hematologic Disorders (e.g., Polycythemia Vera) – Excess red blood cell production can increase blood viscosity, leading to histamine release and itching, especially after hot showers.
Malignancies (e.g., Lymphoma, Leukemia) – Cancers like Hodgkin’s lymphoma can cause severe pruritus due to immune system activation and release of inflammatory mediators.
What are red flag symptoms associated with itch?
Weight loss, night sweats, fever, lymphadenopathy, jaundice, dark urine, pale stools.
Which liver conditions commonly cause pruritus?
Primary biliary cholangitis, cholestasis of pregnancy, obstructive jaundice.
Conditions like cirrhosis and bile duct obstruction lead to bile salt accumulation, which irritates nerve endings and causes severe itching, often worse at night.
Which renal condition is a major cause of pruritus?
Chronic kidney disease (uremic pruritus).
Impaired kidney function leads to the buildup of toxins in the blood, which can cause persistent itching, especially on the back and limbs.
What are common medications that can cause pruritus?
Opioids, ACE inhibitors, NSAIDs, statins, chloroquine, hydroxychloroquine.
waht are some obs causes of itch
Intrahepatic cholsetatsis of pregnacy
HELP syndrome
Polymorphic erruption of pregnacy
What is the characteristic feature of scabies-related itch?
Worse at night, often involves finger webs, wrists, and genitals, presence of burrows.
small red burrows
What skin condition presents with itchy, silvery plaques on extensor surfaces?
Psoriasis.
What are typical features of atopic eczema?
Dry, itchy, inflamed skin, often in flexural areas (elbows, knees, neck).
What is the first-line treatment for pruritus due to eczema?
Emollients:
- E45 (thinner)
- Aveeno (oatmill oil, not petrollerum jelly)
- Diprobase (thinner)
Oilatum (thicker)
Topical steroids
Steroids
- Dermovate (most potent, palms and soles only)
- Eumovate
- Elocon
- Betnovate
- Hydrocortisone (weakest)
Higher potency for shorter, is better for skin
What is the first-line treatment for urticaria?
Oral antihistamines
Antihistamines
- Chlorphenamine /Piriton (sedative)
- Fexofenadine / Telfast (non sedating)
- Loratadine - (non sedating) - Cetirizine - (non sedating) .
How is scabies treated in primary care?
Permethrin 5% cream applied to the whole body, repeated after 7 days.
What investigations would you request for persistent generalised itch?
FBC, LFTs, U&Es, TFTs, iron studies, CRP/ESR. Ferritin
What additional tests might be needed if pruritus is unexplained?
HIV test, hepatitis panel, ANA (autoimmune diseases), skin biopsy (if dermatological cause suspected).
How does cholestatic pruritus typically present?
Generalised itch, worse on palms and soles, associated with jaundice, pale stools, and dark urine.
How is pruritus in chronic kidney disease managed?
Emollients, antihistamines, gabapentin, optimising dialysis.
What are some key non-dermatological causes of nocturnal pruritus?
Scabies, liver disease, iron deficiency, psychogenic pruritus.
What is a common psychological cause of pruritus?
Stress-related pruritus or delusional parasitosis.
Why is a thorough medication review important in a patient with generalised itch?
Certain drugs (opioids, NSAIDs, ACE inhibitors) can trigger pruritus.
What is the role of antihistamines in the management of itch?
Effective for histamine-mediated conditions (urticaria, allergic reactions) but less effective for systemic pruritus.